BE431048A - - Google Patents

Info

Publication number
BE431048A
BE431048A BE431048DA BE431048A BE 431048 A BE431048 A BE 431048A BE 431048D A BE431048D A BE 431048DA BE 431048 A BE431048 A BE 431048A
Authority
BE
Belgium
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of BE431048A publication Critical patent/BE431048A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
  • Amplifiers (AREA)
BE431048D 1937-11-12 BE431048A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6093/39A GB507746A (en) 1937-11-12 1937-11-12 Improvements in or relating to electrical signalling systems

Publications (1)

Publication Number Publication Date
BE431048A true BE431048A (en)

Family

ID=9808241

Family Applications (1)

Application Number Title Priority Date Filing Date
BE431048D BE431048A (en) 1937-11-12

Country Status (3)

Country Link
US (1) US2282271A (en)
BE (1) BE431048A (en)
GB (1) GB507746A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586365A (en) * 1947-03-20 1952-02-19 Westinghouse Electric Corp Means for eliminating spurious frequencies
NL75784C (en) * 1947-07-09
US2561602A (en) * 1947-07-29 1951-07-24 Thomas J Valentino Apparatus for making aural announcements
US2826638A (en) * 1952-04-26 1958-03-11 Bell Telephone Labor Inc Signaling system
US2749390A (en) * 1952-12-02 1956-06-05 Itt Ringing circuit for telephone line and radio order wire
US2806903A (en) * 1954-03-24 1957-09-17 Int Standard Electric Corp Voice frequency signal receivers
DE1487973B2 (en) * 1966-05-12 1970-10-08 Standard Elektrik Lorenz Ag, 7000 Stuttgart Circuit arrangement for a voice-protected single or multi-frequency signal receiver

Also Published As

Publication number Publication date
GB507746A (en) 1939-06-12
US2282271A (en) 1942-05-05

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